如何在 MomentJS 上获取 Date 对象但作为 UTC（防止 `toDate()` 成为 `locale`）？

Question

First of all, I really need a Date object because I'm using ReactDatePicker and the selected prop requires it. And I also really have to use momentjs .

The bit of code I need to work with is this:

// this logs a Moment object
const date = moment(moment.utc().format())

// this logs something like
// Tue Jul 20 2021 17:08:28 GMT+0100 (Western European Summer Time)
const dateObj = date.toDate()

As you can see, no matter the amount of times that I convert my moment() into UTC , toDate() always converts it back to locale time and I need to prevent this while still keeping a Date object that comes from .toDate() .

How can I do this?

Answer 1

You need to use the .valueOf() method.

Following on from your example

// this logs a Moment object
const date = moment(moment.utc().valueOf())

// This will output something like 2021-07-20T16:14:39.636Z
const dateObj = date.toDate()

 // this logs a Moment object const date = moment(moment.utc().valueOf()) // This will output something like 2021-07-20T16:14:39.636Z const dateObj = date.toDate() console.log("UTC time: ", dateObj)

 <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.27.0/moment.min.js"></script>

Answer 2

I found this thread .

Where someone found success by placing .format() out of the brackets. For me it yields the same result, but it might be worth trying if you are still having problems.

 const date = moment(moment.utc()) const dateObj = moment(date.format()) // Equivalent to moment(moment(moment.utc()).format()) console.log("UTC time: ", dateObj) // Should output UTC time console.log("dateObj is an " + typeof dateObj) console.log("dateObj is " + (dateObj._isAMomentObject ? "a moment object" : "not a moment object"))

 <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.27.0/moment.min.js"></script>